Question

在停止循环之前，如何让循环写入文件？

例如

outFile = "ExampleFile.txt", "w"
example = raw_input(" enter number. Negative to stop ")
while example >= 0:
    example = raw_input("enter number. Negative to stop")
    outFile.write("The number is", example,+ "\n")

我觉得我很接近，但我不确定。我不知道如何特别搜索这个问题。对不起，当我输入的数据超过2时，我一直收到错误声明该函数需要1个参数。

import os.path
outFile = open("purchases.txt","w")
quantity = float(raw_input("What is the quantity of the item :"))
cost = float(raw_input("How much is each item :"))


while quantity and cost >= 0:
    quantity = float(raw_input("What is the quantity of the item :"))
    cost = float(raw_input("How much is each item :"))
    total = quantity * cost
    outFile.write("The quantity is %s\n"%(quantity))
    outFile.write("the cost of the previous quality is $s\n" %(cost))
    outFile.close()
    outFile = open("purchases.txt","a")
    outFile.write("The total is ",total)
    outFile.close()

Answer 1

当你写：

outFile = "ExampleFile.txt", "w"

您创建了tuple，而不是file对象。

你可能想写：

outFile = open('ExampleFile.txt','w')

当然，使用上下文管理器可以做得更好：

with open('ExampleFile.txt','w') as outFile:
    #...

您的代码有第二个错误：

outFile.write("The number is", example,+ "\n")

baring SyntaxError（,+），file.write只接受1个参数。你可能想要这样的东西：

outFile.write("The number is {0}\n".format(example))

或使用旧式字符串格式（根据要求）：

outFile.write("The number is %s\n"%(example))

我的循环和文件I / O.

1 个答案: